The Slim-Claw will fasten to both 1-1/2" pipe (1.90" OD) and 2" OD truss tube. The Slim Claw has a 3-1/2" T-handle, so no tools are required to fasten to the pipe. Comes with 1" x 1/2"-13 TPI Grade 5 fastener and 1" diameter Belleville Spring washer.